Magnetic resonance imaging apparatus including two orthogonal r.f. coils
US4712069A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1986 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Mar 18, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3678
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an apparatus for performing magnetic resonance measurements by means of an orthogonal system of excitation detection coils there is provided a switching circuit for powering and reading the coil system which includes a 1/4 .lambda. coaxial conductor as a connection between the two coil assemblies and a 1/4 .lambda. coaxial conductor with a 90.degree. phase delay as a connection between the first 1/4 .lambda. conductor and the second coil assembly and a detection device. By suitable tuning of the relevant circuit components and the coils, preferably based on 50 Ohms, a simple switching circuit with appropriate matching and phase correction is thus achieved. Specifically, the r.f. power source can be connected to the circuit via an n .lambda. conductor. In the open condition during detection, the n .lambda. conductor represents an infinite impedance for the switching circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.